Extract out FileTypes namespace

SabreTools.FileTypes/Aaru/ChecksumEntry.cs

@@ -0,0 +1,43 @@
+using System.IO;
+using System.Text;
+
+using SabreTools.Core;
+
+namespace SabreTools.FileTypes.Aaru
+{
+    /// <summary>
+    /// Checksum entry, followed by checksum data itself
+    /// </summary>
+    /// <see cref="https://github.com/aaru-dps/Aaru/blob/master/Aaru.Images/AaruFormat/Structs.cs" />
+    public class ChecksumEntry
+    {
+        /// <summary>Checksum algorithm</summary>
+        public AaruChecksumAlgorithm type;
+        /// <summary>Length in bytes of checksum that follows this structure</summary>
+        public uint length;
+        /// <summary>Checksum that follows this structure</summary>
+        public byte[] checksum;
+
+        /// <summary>
+        /// Read a stream as an v
+        /// </summary>
+        /// <param name="stream">ChecksumEntry as a stream</param>
+        /// <returns>Populated ChecksumEntry, null on failure</returns>
+        public static ChecksumEntry Deserialize(Stream stream)
+        {
+            ChecksumEntry checksumEntry = new ChecksumEntry();
+
+            using (BinaryReader br = new BinaryReader(stream, Encoding.Default, true))
+            {
+                checksumEntry.type = (AaruChecksumAlgorithm)br.ReadByte();
+                checksumEntry.length = br.ReadUInt32();
+                if (checksumEntry.length == 0)
+                    return null;
+
+                checksumEntry.checksum = br.ReadBytes((int)checksumEntry.length);
+            }
+
+            return checksumEntry;
+        }
+    }
+}